Combined thermostatic and time heat control for stove ovens



May 21, 1935. B. E. MEACHAM 2,002,409

COMBINED THERMOSTATIC AND TIME HEAT CONTROL FOR STOVE OVENS Filed Aug.26, 1932 4 Sheets-Sheet I 1 gwuc nm (SEMM Q inn. U Q:

y 1935- B. E. MEACHAM 2,002,409

COMBINED THERMOSTATIC AND TIME HEAT CONTROL FOR STOVE OVENS 4Sheets-Sheet 2 Filed Aug. 26, 1932 y 1935- B. E. MEACHAM 2,002,409

COMBINED THERMOSTATIC AND TIME HEAT CONTROL FOR STOVE OVENS Filed Aug.26, 1932 4 Sheets-Sheet 3 QA J0 J3 61 J3 M M N (5-.MM

May 21, 1935. B. E. MEACHAM 2,002,409

COMBINED THERMOSTATIC AND TIME HEAT CONTROL FOR STOVE OVENS Fil ed Aug.26, 1932 4 Sheets-Sheet 4 Patented May 21, 1935 COMBINED THERMOSTATICANDTILIE HEAT CONTROLFOR STOVE OVENS Benjamin Edward Meacham, Lorain,Ohio, as-

signor to American Stove Company, St. Louis, Mo., a corporation of NewJersey Application August 2 6, 1932, Serial No. 630.606 13 Claims. (Cl-236-15) This invention relates to an improvement in a combinedthermostatic and time heat control for stove ovens and is a constructionparticularly adapted and suited for-use in connection with the ovens ofdomestic gas cooking stoves or ranges.

The primary object of the invention is the provision of a new andimproved heat control for stove ovens.

A further object of the present invention is the provision of athermostatic oven heat control in combination with a time control whichis automatic in operation and is still so designed and constructed as tobe safe and eflicient in operation.

Another and primary object of the present invention is the provision ofan improved thermostatic oven heat control so constructed as to make .itpossible to maintain in the oven a given heat of a lower temperaturethanit has been possible heretofore to successfully maintain in a stoveoven.

' Another and further object of the invention is the provision of anoven heat control which is so constructed as to eliminate to thegreatest possible degree the possibility of a flash back at the time theoven burner is ignited.

A still further objectof the invention is the provision of a new andimproved snap action temperature control valve. v

A still further object ofthe invention is the provision of athermostatic oven heat control wherein the heat regulator governs thegas supply to a pilot valve which in turn governs the gas deliverythrough the heat regulator to the oven burner.

Other specific objects and novel features of construction and improvedresults of the invention will appear in more detail in the followingdescription when read in the light of the accompanying drawings. a

In the drawings:

Figure 1 is a view in front elevation of agas range equipped with thepresent heat control.

Fig. 2 is an end view of the range, aportion of the stove being brokenaway and shown in section to more clearly illustrate the construction.

Fig. 3 is a top plan view of the range.

Fig. 4 is a rear view of the range.

Fig. 5 is a sectional view through the snap action pilot control gasvalve.

Fig. 6 is a rear viewof the thermostatic heat regulator.

Fig. 7 is a vertical sectional view through the heat regulator.

Fig. 8 is a front view of the heat regulator.

Fig. 9 is a sectional view taken on the line 95 of Figure 7 looking in'the direction indicated by arrow.

Fig. 10 is a detailed view in elevation of the 5 timecontrolled valveand the clock for operating the same. r

Fig. 11 is a rear view of the range illustrating a modified form of theinvention.

In the drawings a conventional type of domes- 10 tic gas cooking rangeis illustrated, A designat-- ing the cooking top portion of the rangeand B and C the ovens thereof.

With the conventional range in mind the present invention will first bedescribed in broad 15 terms and details of the construction brought outlater in the description.

D is a thermostatic heat regulator and E is a clock for controlling thevalve F. Both the regulator and the clock are preferably positioned atand above the rear edge of the oven top but they. need not essentiallybe so positioned.

A thermostatically operated valve is designated at G and is in the maingas or fuel supply line H. 'A gas supply line from this valve'G to theoven burner K isdesignated at L. A gas or fuel conduit M joins thethermostatic regulator D and the thermostatic valve construction G. Agas conduit N connects the thermostatic regulator with the timecontrolled valve F. A gas conduit O connects the time operated valveFwith the pilot light P which is positioned in the cooking top burnerchamber adjacent the oven burner. A thermostatic element Q for operatingthe thermostatic valve G extends into the cooking top burner chamber andover the pilot light P. The thermostatic regulator D has aheatresponsive element R which is positioned in the oven where it issubjected to the heat temperature thereof.

Upon describing the present heat control in detail attention is directedto the fact that the present control mechanism works on the principlethat the oven heat regulator turns on and off the gas supply to thesafety pilot light P and the presence orabsence of flame at this pilotlight controls the delivery of fuel to the oven burner. This is adeparture fromthe principle of operation of oven heat regulators nowknown and in use in that heretofore the regulator has directlycontrolled the delivery of fuel to the burner by being positioned in thefuel li e to the burner.

It is due to the particular and novel manner of operation of applicant'sheat control together 6 5 been heretofore possible to maintain in 20been provided for maintaining at the burner 30 tenance of a considerableamount of .pliedtoit, MT.

10 present improved heat control tests have proven that a temperature aslow as 200? F. can be maintained for as long a period as desired.Maintenance of a continued low temperature in the oven is accomplishedby completely extinguish- I5 ing the flame at the oven burner when theheat regulator acts whereas heretofore when the regulator went intoaction it did not completely extinguish the flame at the oven burner forthe reason that a by-pass fuel passageway has always a small flame. Theby-pass had to be large enough to provide sufliclent fuel to support aflame at all the ports of the oven burners to prevent unburnt gas andother obnoxious gasses from cs- 25 caping into the oven and thence-intothe room.

In addition there was a pilot light fire which -burned as long as theoven was in operation.

As a consequence there was in the oven, even when the heat regulator wasclosed, the mainflame which produced a considerable amount of heat.Consequently, the pilot light and'the minimum flre at the oven burnerwhen the regulator was closed cause a buildingup of oven heat.temperature 35 which made it impossible to maintain in a well insulatedoven a thermostatically controlled heat lowerthan300 F.-

To the end that the present invention will -be more fully understood andthe significance 40 and importance of applicant's heat control beingable to provide for a maintained heat of. less than 300 F. in the'oven,a detailed description of the parts and mechanism going into the make-upof applicant's improved heat con- 45 trol will now be given.

Having reference particularly to Figures 2, 3 and 4 of the drawings itwill be seen that the fuel conduit H to the safety thermostaticallycontrolled valve G is connected to the main fuel 50 supply manifold S ofthe'gas range in the burner chamber beneath the cooking top portion ofthe range, as clearly indicated at I. in Figure 2 of the The admissionof fuel to the conduit -H is under the control of a 55 valve which hasan elongated operating handle ll positioned at the front of the cookingtop.

portionoftherange. A small constantlyburning flame is maintained at aconstant burn-' ing pilot light T. This pilot light T is in the rangeoven and receives its gas'through a con- 7 duit l2 which is connected tothe main supply manifoldsasat l3. Itistobenoted thatthe safety pilotlight P is of a T-shape in that it has a portion N in the burner chamberof the cool:-

65 ing top portion of the'range and it is this portion of the pilotlight which is immediately beneath the thermo element Q of the safetythermostatic valve G. The leg portion l of this pilot extends into theoven and terminates ad- 70 .iacentthe constant burning pilot T. The ovenburner will of course be ignited, when gas is supby the flames of boththe pilots P Having reference now to the thermostatically 75 operatedsafety valve G which illustrated in detail in Figure.5 of the drawings,here it will be seen that there 'is ahousing l6 which is divided into achamber l1 and a chamber II by a valve l3. There is a second housing 20having therein a chamber 2|. The housing l3 has a hollow threadedextension 22 which is threadedly connected. to the housing 20 andcommunication between the chamber l3 of the housing l6 and the chamber2| of the housing 20 is had through this tubular extension 22. The gasconduit L to the oven burner is in communication with the chamber 11 andthe gas supply pipe H from the main gas or fuel supply manifold Scommunicates with the chamber l8. Thus the valve l3 which is normallyheld on its seat by a coil spring 23.will normally close communicatipnbetween the fuel inlet to the chamber l3 and the fuel outlet fromchamber2| and from that chamber by the pipe M to the thermostatic regulator D.

The thermo elementQ is supported by the w housing 20. tube 24 containinga rod 25 of some suitable nonexpansible material which has its end 26extending into the chamber 2| for engagement with the pivotally mountedlever 21, which lever in turn is in operative engagement with thepivotally mounted lever 23. A carrier 30 is reciprocable within thechamber l8 and is provided with an This thermo element is a copperelongated stem 3| having an enlarged head 32 behind which is a coilspring 33 which tends normally to hold the head 32 in engagement withthe pivotally mounted lever 23 which will in turn cause engagementbetween this lever and the lever 21 and engagement'betwe'en the lever 21and the end 26 of the rod 25 of the thermo member Q.

The valve I9 is provided with a rod extension into the chamber l8 andthis rod extension carries a cone 34 intermediate the length of the rodwhile the end 35 of the rod reciprocably carries a head 36- which isheld normally in engagement with the inturned ends 31 of a pair ofpivotally mounted levers 33 by a coilspring 39. These conethe springtension on the arms carrying the rollers by the 33 will cause the valveI! to open with asnap. The degreeto which this valve lt'cpens is underthe control or regu lated by a set-screw 42-.

It will be. obvious that when the copper tube 24 cools the reverseaction will take place and the, valve l3 will snap closed under thetension built up in the coil springs 23 and 33.

It is the snap action of this valve which controls the admission of fuelto the oven burner, which eliminates to the greatest possible degree thelikelihood of a flash back". Applicant has discovered that a flash backis most likely to occur with a very lean mixture of gas and air in theburner, which. condition is most likely to occur if the gas to theburner is turned on slowly. Thus by snapping the valve open fordeliveryof a full supply of gas to the ovenburner the likelihood of aflash back is to a large degree eliminated.

It is to be understood however that the present heat control is notdependent upon a snap action valve as in a recent test with a quickacting throttling valve operated by bi-metal thermo element a minimumtemperature varying between 185 F. and 190 F. was maintained in the ovenof a cooking range. The gas to the oven burner was on fifteen seconds inevery six minutes. It was found that each cycle was six minutes longalthough the duration of a cycle would vary in accordance with thedegree of insulation of the stove oven.

Coming now to the heat regulator the construction of which isillustrated in detail in Figures 6 to 9 inclusive of the drawings, itwill be apparent that this device is comparatively simple inconstruction.

As previously mentioned the thermostatic element. is designated at R andis preferably a strip of bi-metal one end of which is secured as at 43to the regulator housing or carrier 44 while its opposite end 45 is inengagement with a cap 46 carried by a stem 41 which is reciprocablewithin a guide sleeve 48 and has its opposite end 49- adapted forengagement with a valve 50. The valve 50 is positioned within a housing5| and when in engagement with itsseat 52, as it normally is by reasonof a coil spring 53, divides this housing into two chambers 54 and 55.The fuel pipe line M from the safety valve G communicates with thechamber 55 and the fuel pipe line- N which interconnects the regulatorand the time operated. valve F communicates with the chamber 54.Consequently fuel can pass to the'time operated valve only when thevalve 50 of th regulator is open. I

It is intended of course that the regulator housing or support 44 be sopositioned that the thermo element R is in the stove oven and subjectedto the heat therein. The expansion and contraction of this thermoelement causes the opening and closing of the valve 58. A lever 56pivotally mounted as at 51 forms a part of the regulator mechanism. Apin 56 passes loosely through. the lower end of this lever and at oneend carries a saddle 59 over'which passes an intermediate portion of thethermo strip R. A pin 60 extends across the saddle above the thermostrip and the pin or stem 58 beyond the lever is provided with a cotterkey 6|. As a consequence the pin or stem 58 can beinoved by moving thelever. The lever is moved to alter the position of the thermo strip toeffect the temperature adjustments at which the valve 50 wil be openedby the thermo member. To move the lever 56 and to obtain thistemperature adjustment the regulator is provided with an adjustingstem.62 threadedly mounted as at 63 in the upper end of the regulatorhousing or support 44. The upper end of the lever 56 is bifurcated as at64 and engages the inner end of this adjusting stem behind its head 65.The outer end of the adjusting stem is provided with a dial 66 (seeFigure 1) by means of which a careful calibration of the temperaturesetting or adjustment can be had.

The time operated valve F is of an extremely simple construction in thatit comprises a valve (not shown) within a-- suitable housing- 61 andhaving a stem portion 68 extending outwardly beyond the housing. A clockE is positioned to have operative engagement with this valve extension68. The clock is provided with an ordinary time dial 69 and in additionwith an on dial Ill and"ofi dial H. Each of these dials is provided witha setting hand and by the manipulation of these hands in conjunctionwith the clock mechanism an opening of the valve can be had at anydesired time and a closing of the valve can be had at any desired time,

It is not believed necessary to go into a minute and detaileddescription of the clock mechanism which effects the valve manipulationin that many such devices can be bought on the open market and theparticular construction which effects the opening and closing of thetime operated valve forms no part of the present invention. Insolong asa dependable clock mechanism for effecting the opening and closing ofthe valve is provided the proper operation of the heat control isassured.

A modified form of the invention is illustrated in Figure 11 of thedrawings. Relative to this modification it is suffice to say that it isexactly like the preferred form of the invention with the exception thatthe time operated valve has been eliminated. It is of course possiblethat someone might desire an installation of the present heat controlwithout the time control feature. When the time contfol feature iseliminated the clock E and the clock operated valve F are dispensed withas are also the pipe lines N and O. In this form of the invention thefuel is brought from the heat regulator E to the safety pilot light P bythe pipe line W which pipe line incidentally supplants the eliminatedpipe conduits N and 0.

Operation A short description of the operation seems advisable.

The present heat control has of course been developed to make itpossible for the housewife, to cook in her absence from the kitchen orhome.

To accomplish this'end the housewife decides the length of time as vwellas the temperaturerequired to accomplish the cooking desired. Havingdetermined this she sets the heat regulator at the desired temperatureand sets the on and off dials of the clock at the proper times to turnthe gas positively on and off to the safety pilot light P. She alsoopens the gas valve ll so that gas can fiow from the main fuel supplymanifold S to the safety control valve G. Gas is being constantlysupplied at all times to the constant burning pilot light T and thispilot light is at all times ignited. If this constant burning pilotlight should for any reason become extinguished the entire heat controlwould fail to function but no gas would be supplied to the position thuspermitting the flow of fuel into the chamber 54 and from that chamber bythe pipe N by the time controlled valve which now being open permitsfuel to pass through the pipe 0 to the safety pilot light P.

The fuel reaching the safety pilot light P is ignited by the constantburning pilot light T,

and in the course of a few seconds the flame the oven burner.

from the safety pilot P heats the 'thermo element Q of the safety valveGsufficiently to cause its expansion and thus permit the spring 33 toact to open the valve 19 with the snap action heretofore described. Thevalve 19 having snapped open'fuel immediately passes into the chamber llof the regulator and from that chamher by the pipe L intothe burner Kwhere it is ignited by both the constant burning pilot T and the portionl5 of the safety pilot light P.

The burner will remain lighted until the oven reaches the settemperature at which time the thermo member R of the regulator act topermit the coil spring 53 of the valve 50 to close this valve and thuscut off delivery of gas to the time controlled valve and from that valveto the safety pilot light P. The thermo element Q'of the safety valve Gbeing subjected only to the. heat of the safety pilot light will coolwhen this pilot light is,extinguished and in a few seconds timethe'valyg IQ of the safety valve G will close and cut'oif the deliveryofgas to the pipe L to When the oven has cooled sufliciently to permit theheat regulator valve 50 to again open the operation heretofore'describedwill be repeated and this cycle of operation will continue to repeatitself to maintain in the oven the set temperature of the regulator.

When the time is reached to cause thetime operated valve to bepermanently closed this action will take place and the heat control willfail, to function further unless it is. set. when the housewife returnsshe will' find the oven burner and safety pilot light extinguished andthe food in the oven properly cooked as she had anticipated.

The operation-of the modified formof the in-' vention will from theforegoing be obvious in that it will be identical with the exceptionthat the heat control will continue its cycles of operation until thegas valve II is manually i From the foregoing it will be seen that a newmethod of automatic safety ignition for oven burners and of combinedovenheat and time controlled regulated temperature is provided and thatthe present heat control permits of maintaining a lower set temperaturein the oven than has been heretofore possible. That the possibility offlash back has been greatly eliminated and thatthe heat regulator can besimplified in its construction as it is not necessary to provide aby-pass gas passageway to maintain at the oven at all times a flame isevident.

To prevent injury to the thermostatic element Q. which would result inthe event the safety pilot light P burned at full flame orfull strengththroughout the operation of the stove, means is provided for reducingthe size of the flame at this pilotlightr duringthe tion of the ovenburner. Toprovide for this control theend I00 of the housing l6communicates with the tubular extension 22 through an opening -l0l whichactsas aavalve seat-for the tapered portion IMof'the elongated stem 3|of the carrier 30. It will be obvious that when the valve is is open fordelivery of fuel to the oven burnen through the conduit L the taperedportion 102 of thestem' 3| will have-approached the opening lll'andpartially closed it to reduce the amount of fuel which passes throughthe tubular extension 22 1 into the housing'zl an'd from that housing tothe safetypilot light P-through the conduit M. Thus,---

when fuel is delivered .to the oven burner the amount of fuel deliveryto the safety pilot light is reduced-thus reducing the flame at thesafety pilot light and preventing over-heating and injury to thethermostatic element Q.

Having thus described my invention what I claim and desire to secure byLetters Patent is:

1. An improvedheat control for use with a stove having an oven with agaseous fuel burner therein and a constant burning pilot light for saidburner, comprising a safety pilot light adapta1 tobe ignited by saidconstant burning pilot light, a main fuel line, a thermostaticallyoperated valve in saidtmain fuel line for controlling the flow of fuelto the burner, a thermo member positioned in the heat zone of saidsafety pilot light and remote to the heat zone of the oven for actuatingsaid valve, 2. second fuel line leading to the safety pilot light, athermostatic regulator operatable by the heat in said oven posi-'-tioned in said second fuel line, a time operated valve positionedinsaid second fuel line back of said thermostatic regulator, and timeoperated means for operating said time controlled valve to open andclose the same at predetermined times, the parts operating as and forthepurpose described.

2. An improved heat control for use with a stove having an oven with agaseous fuel burner therein and a. constant burning pilot light for saidburner, comprising a supplemental pilot light adapted to be ignited bysaid constant buming pilot light, a fuel line for said safety pilotlight having first therein-ea thermostatically operated safety valveoperatable by the heat from said safety pilot light, and secondlytherein a thermostatically operated oven heat regulator for controllingthe flow of fuel through said line,

gas

and thirdly therein a time operated valve with means for opening andclosing said valve at predetermined times, a fuel'connection betweensaid safety valve and the oven burner, and said fuel connection beingnormally closed and being opened for the delivery of fuel to the ovenburner only when said safety pilot light is burning.

3. In a device of the character described, a stove having an oven and aheating burner there'- for and provided with a cooking top portionhaving an enclosed burner chamber, a fuel delivery conduit in the burnerchamber of the cooking top portion of the stove, a main fuel lineextending from said fuel conduit to the oven burner, a

safety control valve positioned in said main fuel line, 'saidsafetycontrol valve comprising a housing divided into two parts by a valve,said valve controlling the passage of the fuel to the oven burner, asafety pilot light positioned within the burner chamber of the cookingtop portion of the stove, a 'thermo-element positioned within the heatzone of the safety pilot light and operatively connected to thesafetycontrol valve, a constant burning pilot light infthe oven adjacent theoven burner, means to cause the ignition of the safety pilot light bythe constant burning pilot light, a second'fuel line'for the delivery offuel tothe safety pilot light, said line getting its fuel from thehousing of the safety control valve at a point in front of the safetycontrol valve, a-m'anually adjustable heat regulator. in said secondfuel line at a point between the connection of said fuel line withthehousing of thesafety control valve and its connection with the safetypilot light,

said thermostatic regulator operatable by the heat within the oven andhaving means whereby the regulator can-be manually set'to be main:tained in said oven any predetermined heat temperature, the flow in thesecond fuel line being setting dial supported upon the rear edge of thecontrolled by said thermostatic heat regulator, the parts operatingwhereby the delivery of fuel to the safety pilot light is solely underthe control of the thermostatic regulator and the delivery of fuel tothe oven burner is solely under the control of the safety control valve.

4. A device of the construction defined in claim constant burning pilotlight for said burner, a

safety pilot light and a secondary fuel supply line thereto, athermostatically operated mechanism for opening said main valve andhaving a thermo element positioned in the heat zone of said safety pilotlight, a valve adapted to partially close the delivery of fuel to saidpilot light, an operative connection between the said last named valveand the thermostatically operated mecha nism to partially close saidvalve as the main valve is opened, a thermostatically operated heatcontrol mechanism in the fuel line to the safety pilot light andoperable by the heat from said main burner, a time operated valve in thefuel line to the safety pilot light, the parts operating as and for thepurpose described.

6. In a fuel control device, the combination of an oven provided with aburner having a fuel supply line', a housing forming a portion of saidfuel line and containing a normally closed main valve for controllingthe supply of fuel to said main burner, a constant burning pilot lightfor said burner, a safety pilot light positioned exteriorly of the ovenand a secondary fuel supply line thereto receiving its fuel from saidhousing at a point in front of the main valve, a thermostaticallyoperated mechanism for opening and closing said main valve and having athermo element positioned in the heat zone of said safety pilot light,said mechanism including a reciprocable member within said housing forconveying a snap action operation to the main valve, said reciprocablemember including avalve portion adapted to partially close the deliveryof fuel to the safety pilot light when the main valve is opened, athermostatically operated heat control mechanism in the fuel line to thesafety pilot light and operable by the heat generated in the oven by themain burner, and a time operated valve in the fuel line to the safetypilot light, the

- range having an oven and an adjacent cooking top portion, comprising amain fuel line to the oven burner, a normally closed main valve forcontrolling the supply of fuel to said burner, a constant burning pilotlight in said oven for said oven burner, a safety pilot light positionedexteriorly of the oven in the cooking top portion of the range andreceiving gas from a secondary fuel supply line, means to cause theignition of said safety pilot light from the main pilot light, athermostatically operated oven heat control mechanism in said secondaryfuel line and operable by the heat generatedin the oven by the ovenburner, a time operated valve in said secondary fuel line, said ovenheat control mechanism having a thermo element extending into the over;from the rear thereof and having a temperature oven, a thermostaticallyoperated mechanism for opening the main valve and having a thermoelement positioned in the heat zone of said safety pilot light, a valvefor partially closing the delivery of fuel to the safety pilot light,and an operative connection between said last named valve and thethermostatically operated mechanism to partially close said valve as themain valve'is opened, the parts operating as and for the purposedescribed.

8. In a fuel control device, the combination of an oven provided with aburner having a fuel supply line, a normally closed main valve forcontrolling the supply of fuel to said main burner,

'a constant burning pilot light for said burner,

a safety pilot light and a secondary fuel supply line thereto, athermostatically operated mechanlsm for opening said main valve andhaving a thermo element positioned in the heat zone of said safety pilotlight, a valve adapted to partially close the delivery of fuel to saidpilot light, an operative connection between the said last named valveand the thermostatically operated mechanism to partially close saidvalve as the main valve is opened, a thermostatically operated heatcontrol mechanism in the fuel line to the safety pilot light andoperable by the heat from said main burner, the parts operating as andfor the purpose described. i

9. In a fuel control device, the combination of an oven provided with aburner having a fuel supply line,'a fuel line containing a normallyclosed main valve for controlling the supply of fuel to said mainburner, a constant burning pilot light for said burner, a safety pilotlight positioned exteriorly of the oven and a secondary fuel supply linethereto receiving its fuel at a point in front of the main valve, athermostatically operated mechanism for opening and closing said mainvalve and having a thermo element positioned in the heat zone of saidsafety pilot light, said mechanism including a reciprocable memberWithin said housing for conveying a snap action operation to the mainvalve, said reciprocable member including a valve portion adapted topartially close 'the delivery of fuel to the safety pilot light when themain valve is opened, a thermostatically operated heat control mechanismin the fuel line to the safety pilot light and operable "by the heatgenerated in the oven by the mainburner, and a time operated valve inthe fuel line to the safety pilot light, the parts operating as and forthe purpose described.

10. In a fuel control device, the combination of an oven provided with aburner having a fuel supsaid housing for conveying a snap action opera-'tion to the main valve, said reciprocable member including a valveportion adapted to partially close the delivery of fuel to the safetypilot light when the main valve is opened, a thermostatically operatedheat control mechanism in the fuel line to the safety pilot light andoperable by the the parts operating as and for the purpose described.

1l..An improved automatic control fora gas range having an oven and anadjacent cooking top portion, comprising a main fuel line to. the ovenburner, anormally closed main valve for controlling the supply of fuelto said burner, a

constant burning pilot light in said oven for said oven burner, a safetypilot light positioned exteriorly of the oven in the cooking top portionof the range andreceiving gas from a secondary fuel supply line, meanstocause the ignition of c said safety pilot light from the main pilotlight,

positioned in the heat zone of said safety pilot light, a valve forpartially closing the delivery of fuel to the safety pilot light, and anoperative connection between said last named valve and thethermostatically operated mechanism to partially close said valve as themain valve is opened,

the parts operating as and for the purpose described.

12. In a device of the character described, a stove having an oven and aheating burnertherefor' and provided with a cooking-top portion havingan enclosed burner chamber, a fuel delivery conduit in the burnerchamber of the c okingtop portion of the stove, a main fuel line'mostatie heat regulator and the time 2,002,400 heat generated in theoven by the main bm'ner,

from said fuel conduit to the oven burner, a safety control'valvepositioned in said main fuel line, said valve controlling the passageofthe fuel to the oven burner, a safety-pilot light pofitioned within theburner chamber of the cooking top portion of the stove, a'thermo elementpositioned within the heat zone the safety pilot light and operativelyconnected to the safety control valve,

a constant burning pilotlight in the oven adia-, cent the oven burner,means to cause the ignition of the safety pilot light by the constantburningpilot light; a second fuel line for the delivery of fuel to thesafety pilot light, said line getting its fuel at a point in front ofthe safety control valve, a manually adjustable .heat regulator in saidsecond fuel line at-a point between the connection of said fuel linewith the housing of the safety control valve and its connection with thesafety pilot light, said thermostatic regulator operatable by the heatwithin the oven and hav-. ing means whereby the regulator can bemanually set to be maintained in said oven any predetermined heattemperature, the flow in the second fuel line being controlled by saidthermostatic heat regulator, tthe parts operating whereby the deliveryof fuel to the safety pilot light is solely under the control of thesafety control valve. a

13. A device of the construction defined in claim 12, wherein a operatedvalve is positioned in the second fuel line to the safety pilot. light,whereby the delivery of fuel to said safety pilot light is under thecontrol of both the thervalve.

BENJAmEDwaRp MEACHAM. 35

